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參數資料
| 型號： | HMS81024E |
| 廠商： | Hynix Semiconductor Inc. |
| 元件分類： | 8位微控制器 |
| 英文描述： | HYNIX SEMICONDUCTOR 8-BIT SINGLE-CHIP MICROCONTROLLERS |
| 中文描述： | Hynix半導體公司的8位單芯片微控制器 |
| 文件頁數： | 39/77頁 |
| 文件大小： | 1112K |
| 代理商： | HMS81024E |
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HMS81004E/08E/16E/24E/32E
36
JUNE 2001 Ver 1.00
11. BASIC INTERVAL TIMER
The HMS81004E/08E/16E/24E/32E has one 8-bit Basic
Interval Timer that is free-run and can not stop. Block dia-
gram is shown in Figure 11-1 .
The Basic Interval Timer generates the time base for
Standby release time, watchdog timer counting, and etc. It
also provides a Basic interval timer interrupt (IFBIT). As
the count overflow from FF
H
to 00
H
, this overflow causes
the interrupt to be generated.
-8bit binary up-counter
-Use the bit output of prescaler as input to secure the oscil-
lation stabilization time after power-on
-Secures the oscillation stabilization time in standby mode
(stop mode) release
-Contents of B.I.T can be read
-Provides the clock for watch dog timer
The Basic Interval Timer is controlled by the clock control
register (CKCTLR) shown in Figure 11-2 . If bit3(BTCL)
of CKCTLR is set to “1”, B.I.T is cleared, and then, after
one machine cycle, BTCL becomes “0”, and B.I.T starts
counting. BTCL is set to ``0`` in reset state.
The input clock of B.I.T can be selected from the prescaler
within a range of 2us to 256us by clock input selection bits
(BTS2~BTS0). (at fex = 4MHz). In reset state, or power
on reset, BTS2=“1”, BTS1= “1”, BTS0= “1” to secure the
longest oscillation stabilization time. B.I.T can generate
the wide range of basic interval time interrupt request (IF-
BIT) by selecting prescaler output.
By reading of the Basic Interval Timer Register (BITR),
we can read counter value of B.I.T. Because B.I.T can be
cleared or read, the spending time up to maximum 65.5ms
can be available. B.I.T is read-only register. If B.I.T reg-
ister is written, then CKCTLR register with same address
is written.
Figure 11-1 Block diagram of Basic Interval Timer
MUX
Basic Interval Timer Interrupt
Select Input clock 3
Basic Interval Timer
source
clock
8-bit up-counter
BTS[2:0]
BTCL
÷
8
÷
16
÷
1024
÷
512
÷
256
÷
128
÷
64
÷
32
To Watchdog timer (WDTR)
CKCTLR
clear
overflow
Internal bus line
clock control register
[0C7
H
]
IFBIT
Read
P
BITR
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